web.xml设置编码格式---在filter 过滤并设置当前要设置的编码格式

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;

/*
*判断在web.xml中是否设置了编码格式的信息
*如果为null 则设置为web.xml的编码格式
*否则设置UTF-8
*/
if(this.encode != null && !this.encode.equals("")) {
request.setCharacterEncoding(this.encode);
response.setCharacterEncoding(this.encode);
}else {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
}
chain.doFilter(request, response);
}
//初始化时获取encode的信息
public void init(FilterConfig fConfig) throws ServletException {
this.encode = fConfig.getInitParameter("encode");
}